Top Definition
the most convenient form of communication for fratstars used to keep up with brothers and of course the sorostitues from the night before. also, a great way to keep up with other people's business and to know who's hooking up with who.
"dude, did you see her fratbook she is totally dating that GDI."
by sorostitute 911 September 02, 2008

The Urban Dictionary Mug

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The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

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The Urban Dictionary Mug

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The Urban Dictionary T-Shirt

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